Rotary pump



Nov. 28, 1944. l w. L. HART 2,363,961

ROTARY PUMP Filed Dec. 5, 1942 2 Sheets-Sheet 1 E 3nncnt o r Walfierg. Hai$ Gttorncu Nov. 28, 1944. w. L. HART 2,363,961

ROTARY PUMP 7 Filed D60. 5, 1942 2 Sheets-Sheet 2 II a rllrzlrr Zmnentor tins in central plan view. I t t w .EEigure 8 is a ;perspective viewxii the rapper :por-

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assass norm! a Will. I Aluiliealion December "5, 1942, Serial No. 488,113

a This iinventionrelates to pumps 'Ior semi-fluid toriplastic materials; such as =concrete or liquid materials of various kinds containing a volume oi solids; "such as, :so'ups, peanut batten etch" The general object of the invention isto produce a t more efflcient pump than that shownin my PatentiNo. 12,04'5;081, issued June 23, -1936,where -efli-' ciency was lost due totriction between the material being ipurnpeddand the casing oi the pump. With the .=general co'biects hamedinview an'd others aas will hereinafter appear, the invention consists .in certain 'novel and useful :features of construction .ortganization of 'parts as here l-inafter described and claimed; and inxorrler that it may be understood, :reieizenoe is to the had to :the accompanying drawings. "in which: 1 Figure 11 "is a side elevation of :a Zhoused pump embodying .the inventionand mounted on wheels for convenience of portability. t t 1 t Figure 12 leisnn enlarged :side "view with the whela' housing andinear sides at the casing and motor-omitted, and certain 'parts shown :in vcentral vertical "longitudinal section; the gate 01 :deflector appearing in side View and engaging a pocket of the rotorior directing ithe icon-tents sthereof through the Ldischarge throat of itheipi p. The

parts shownzin :eievation :aite those shown :at the right-hand side on "the filine 3H1-II of Figure 4.

Figure 13 is :awiew corresponding :to', but larger,

than Figure .2, tand disclosing the gate units withdrawn position, and the aca ms rotatable with the rotor, positioned :telatively to "eiIectuick Aprofl jection :o'f ithe .gate into the :approaching pocket,

to "the 'position :in' which "the taste appears :in Figure 2.-

' .fEigure 4 .isua central vertical :"CI'OBSiCtlOniOf the pump and certain operative rand :suplwi'ting parts thereof, ton the :same scale 'asimgure i2, athe 1 housing being omitted. section vis' taken :on

the iinell'v mam-ea. h t

":Figurefids-a viewionithetsamet-scalezas {Figure 4, showing :the ",pockets of the "srotor; and the: discharge-throat th'ereo'f, in top :plan view, :the sides of the ;poekets tof tthe rctor and the rsiides ot the :casing, and certain ofIthe operativemarts, appearihoriaontal :section and "others in i In the saidsdmwingsml indi'catesaipairofpar ;all1 Lil-beams currying opposite i besr in Elfiior a rtweenithe :bearings 11s a sleeve iCentrally Ebe- :tween the lbearingslis 17a rotor l :incithe :Iorm to! gun gribhon bent zto iprovide #8. 1851128 mei ripheral pockets :of similar :size and form, and shown in this instance, '0! generally hexagonal contour; the high or crest points of the pockets occupying a circular plane concentric of the shaft,

5 the ribbonhetween the saidipoints deflningextern'al concatye-bottomed pockets 6; The bottoms of the pockets, while generally arcuate in form, are each flattened at the endbadvanced with respect to-the direction of rotation :of the rotor the flat portions extending intstnaight lines i from the high points,wpreferably to or slightly 1 beyond the mid-way points of theyrespective pockets; To insure rigidity 101 therihbonandits rotation .Withthe shaft, it lhasia central solid or skeietomweb 7|; welded or otherwisezsecured to it and to the sleeve has shown in Figure 4, and to constitute sides of and hence complete the pockets; :rings l are bolted or otherwise secured to opposite sides of the ribbon, :the external diameterof the rings I corresponding to th circu- .lar plane inwhi'ch the-outer or high points of' the .;pocketshlie, and the internal diameter line of the :rings lying in or .slightlyiinward of the bot- -'tomstof Lthe pockets. h

" h A easing iorsthe rotor consists of ,a pair of sides t8, preferably-mounted upon a. base lain any suitable manner, the sides having circular -openings snugly receiving the rings 8, the tadjacent o r zouter-wedges of the latter and the inner edgesof thehpenings of the sides being reverselyhevelled .(see Figure 4) to provide V-shaped grooves ill containing packing rings ,1 l t to seal the circular joint between the saidrings and sides. At'two points, i. e, where the material handll ed ismlceived and discharged respectively, the :sides have extensions l2 and, respectively forming sides ofa ieedlopemng and a discharge throat, as hereina'tt eridentified, and to holdthe packing rings Il=fl :adiustably clamped inplace to compensate for wear, there are tworings it having "grooves til receiving the packing rings Ill. :Stud bolts .18 secured to the casing sides 29, extend through kthe wings 5M and ar engaged by nuts I13, j'I'o complete the casing, the sides except "where the. extensions i2 and i3 occur, apeper'ipherallyconrnecteditoarcuatehsections I18 and I9 lstruokii'om athe axis-of the shaft, and said sectionsarejbolted r-to ithegrings H at lsuitab le intervalsFbyithrou'gh lholts F20; A wear plate "a lines thesection II,

550 and is screw-bolted .or (fastened thcretoias at 21 t At the rear of the rotor and extending upwardiiy from about the level of the shaft, a bracket 22 superimposed on sectionlll, and holds a 're- :siiient tor compressible :block "23, in close proxiinityrito the path or the high'points r the re-t tor. The block 23 preferably 'slopes' upwardly and rearwardly slightly, and the bracket 22 forms the lower part of the rear side of the feed opening hereinbefore mentioned, which opening is adapted to receive material from a hopper 24,

surmounting and rigid with the casing. The front 7 sidefiof said opening is formed by an upward The sides of'the discharge throat are formed by the forward extensions I3 of the sides 9 of the casing, and to insure smooth passage of the material handled through the throat, the section B, with its lining 20a, terminates forwardly in a reversely curved lip 21,- the section I9 above the throat, having a forwardly-projecting flange 28. A tubular section 29 is bolted to the reversely curved extension 21, and forms an extension of the throat, and secured in opposite sockets of the flange 28 and the top wall of the section 29, is a gasket 30 through whichextends anarcuate gate 3,l,, carried by a rocker frame 32, thelatter being connected by links 33 to the lower ends of swing-bars 34, pivotally suspended fromthe external sides of the casing, and theswing-bars are equippedwith bracket-carried rollers 35,

riding upon a pair of. cams 36 on and rotatable with the sleevel. 'I'he' sleevealso carries gear wheels 31 to which suitable power mechanism, not shown, imparts slow rotation to effect mover'nentof the rotor in the direction indicated bythe arrows on Figures 2 and 3. In this rotation,

the" cams, through the engaging rollers 35, swingbars, links and rocker frame, effect'oscillatory movement of the gate, causing thesameto move into the pockets as said rollers are moved out- I the rotation of therotor successively presents them for contact by the .gate, the contour of the cams being such that ,the gate maintains frictional relation with the straightperipheral faces of the pockets tothe bottoms thereof, at which time the rollers- 35 having reached the related points "of the cams furtherest from the axis thereof, and hence exert no power to continue movement of the gate. As the movement of hopper is mounted on a shaft ",and the latter is operated by any suitable means, such as pulleys on the rotor and agitator shafts, and a belt.

again contacts the casing sides untilit' is forced out of the pocket and. enters the discharge throat. In the interim' between entering and leaving the pocket, the only contact with a stationary part, is momentarily with the compressible blockto guard against the chance of a jamb.

at thatpoint, and that with the wear plate 20a. From the"? above description and drawings, it will be apparent that .I have produced a mecha nism'embodying all ofthe features of advantage set forth as desirable; and it is to be understood that while -l have described and illustrated the 'prer'erred'embodimentl reserve the right changes within'the spirit-and scope, of the appenderlclaims. 1 w I l T I claimz; t I 2 1. In a rotary pump, a base; parallel beams at opposite sides. of the base, a shaft journaled cnthe beams, a sleeve on the shaft between said beams, a'-circular rotor securedonthe sleeve,

comprising. a series of similar peripheral pecketsand rings forming sides for the pockets, a

said pockets, rings securedto thebase and fla niv ing and bridging the joints between the =rotor sides and the first-named openings, gasket rings carried by said flanking rings and ,closin'g the joints between the rings forming the sides'of the rotor and the circular casingopenings -re-' ceiving said sides, the casing of the rotor} includ- 1 ing arcuate sections above and below the rotor and spaced apart at, their endsto form the entry and exit openings for the rotor pockets, the inner sides of said sections being in closefproximity to the perimeters of the ringeshaped sides of the rotor, a feed'hopper communicating with said the rotor is continuous, the bottoms of the pockets apply force to reverse the movement of the gate,- and this withdrawal movement, through the rocker-frame, links and "swing bars, causesv the rollers 35 to move inwardly to the, low points the rotor and the upper side of'said tubular of'thecams, attaining this position'at the same f time the gate reaches the rear high point or crest "of the particular pocket. I The contour of the cams is such that the gate,

when fully advanced into a pocket, is substantially-stationary until the rear crest of the engaged' pocket has reached the pointed or free end of the gate, so that the latter shall fully evacuate thepocket of its contents, into the throat 13. The pocket charges are therefore.

utilized successively under the power. of the rotor, to keep the material passing. through a' tapered nozzle 38 to a distributing pipe, not shown,

entry opening, a material disch f e tubular member communicating with the said exit opening, an arcuateg oscillatory gate projecting into the rotor casin and closing the space between "member, a linkage connecting the gate with the rotor casing, a pair of cams on the said shaft, at

opposite s ides of therotor casing and provided with lobes in radial planes intersecting the-mid points ,of the rotor pockets, and a pair of rollers carried by the s'aidlinkage for engagementby said lobes to cause the gate to enter a pocket and'scrape half the bottom of the pocket and be reversely operated under pressure applied by the remainder of the bottom-of the pocket.

2. In a rotary pump, a base, bearingsiat opposite sides of the base, a horizontal shafi? .iOurnaled onsaid bearings, a rotor mounted on'the shaft, having peripheral pocketsfthe sides of leading toa more or less remote point of deli 7o cry-Lg 1 I To insure continuous gravitative; passage of the contents "of the,--hopper "through the feed opening and into the successively presented pockets of the rotor, an. agitator 39 within the the pockets being in the form of rings of the same diameter as the maximumdia meter of the pockets through opposite high points thereof, a easing having circular openings closelyreceiving the ring-shaped sides of the pockets; said casing comprising rings in flxedrelation to and flank ing the base and the said circular openings, and a pair of arcuate sections below and above the rotor respectively, and spaced apart at their ends to provide entry and exit openings, a bracket superposed upon the section underlying the rotor, an elastic block carried by said bracket in close proximity to the perimeter of the rotor sides and susceptible of yielding to pressure applied by material interposed betw"een it and the rotor, to avoid clogging of the rotor, and means for evacuating material from the pockets as they 5 successively register with the said exit opening.

WALTER L. HART. 

